T&G TG642 RGB Light Waterproof Portable Bluetooth Speaker Support FM / TF Card(Green)Description: 1. Bluetooth 5. 0, fast connection and stable signal, compatible with all Bluetooth devices. 2. 1200mAh battery for up to 10 hours of playtime at 2 3 volume on a full charge. 3. Mesh cover for protect speaker from water, dust, shock. 4. 5W*2 big power with two bass diaphragms on each side, vibrate when playing music. 5. Cylindrical shape and built in left and right channel offer 360 degree stereo. 6. Call function, noise canceling

4 inch A1990 (2018)

the sound is delicate

Material: stainless steel

Dial Display type TFT

One Package Size 24cm * 4cm * 3cm / 9

Sensitivity: -40dB +/- 2dB (0dB = 1V / Pa at 1KHZ)

USB1 interface (black):

60kgs / 23

Light source life: 10000

Load impedance: greater than or equal to 1000 ohms

Waterproof ring material: amorphous high-activity silica gel

you can adjust the color and brightness very easily